Oil-pump construction



Sept. 3, 1929. c. L RAYFIELD 1,727,081

OIL. PUIIP CONSTRUCTION Filed Nov. 5, 1927 i In 30 1 5 55 l 1 122132235;

V 25 60 [56 i4 \\s 35 m 59 .7

Patented Sept. 3, 1929.

UNITED STATES PATENT OFFICE.

CHARLES L. RAYFIELD, OF CHICAGO, ILLINOIS, ASSIGNOR T0 RAYFIELD MANUFAC-TUBING COMPANY, A CORPORATION OF ILLINOIS.

OIL-PUMP CONSTRUCTION.

Application filed November 5, 1927. Serial No. 231,184.

My invention relates to pumps, and more particularly to a rotary pump ofthat type wherein a pivotally mounted ring member is actuated by aneccentric to force the fluid from the pump.

It has been the practice heretofore in a rotary pump of the abovecharacter to provide a link connection for the ring member of the pumpadapted to prevent this member from rotating with the eccentric disposedtherein and also adapted to permit of the ring member having anoscillatory motion. 1 have found that this link construction is not onlyrelatively expensive to make, but also involves expensive machiningopera- .tions in order to properly fit it to the cylinder of the pump,as well as to the oscillatory ring member. Then, too, this constructionis not very satisfactory for the reason that it is exposed toconsiderable wear, and hence is detrimental to the efficiency andlongevity of the pump.

It is, therefore, the object of my invention to provide an improvedrotary pump, wherein the above mentioned linkage is eliminated and anovel and inexpensive pivotal mounting is provided for the ring memberactuated by the eccentric.

Another object of the invention is to provide a relatively simple andinexpensive rotary pump construction capable of handling smallquantities of fluid with relatively high efficiency, and especiallyadapted for use in connection with the pumping'of fuel for oil burnersor the like.

In accordance with the general features of the present invention, Iprovide a rotary pump including a cylinder having inlet and outletpassageways, a rotary eccentric member disposed in the cylinder, a ringor pressure member fitted on the eccentric and adapted to be oscillatedthereby, and a pin anchored in the cylinder and extending through anopening in the edge of the ring member, the ring member being adapted topivot about the pin to force liquid from the inlet passageway into theoutlet passageway. This pin construction is of a very simple andinexpensive nature and not only serves as a vmounting for the ringmember, but also serves as a barrier between the inlet and outletpassageways to prevent leakage therebetween.

Other objects and advantages of my invention will more fully appear fromthe following detailed description taken in connection with theaccompanying drawing,

. which illustrates a single embodiment thereof and in which:

Figure 1 1s a fragmentary vertical sectional View through the rotarypump of my invention; 7

Figure 2 is a cross-sectional view taken on substantially the line IL-IIof Figure 1 looking in the direction indicated by the arrows;

Figure 3 is a cross-sectional view taken on showing the positions of theeccentric and ring member during the discharge stroke of the pump.

In the drawings:

Like reference characters designate similar parts throughout the severalviews.

The reference character 10 designates generally a pump block whichincludes an annular end member or plate 11. Extending through the block10 is a shaft 12 which may be actuated by any suitable source of power.2 V

This shaft extends through a bore 13 of a larger diameter than that ofthe shaft. Disposed in the bore 18 and surrounding the shaft 12 is apacking 14 which is held in place by means of a bearing box 15 and apacking box 16. It will be noted that an end of the shaft 12 projectsoutwardly beyond the annular member 11.

Surrounding the shaft 12 and positioned flush with the end member orplate 11 is a flat member 18 which comprises the cylinder of the pump.The cylinder 18 is secured to the plate or member 11 by an end plate 20through the means of bolts 19 which extend through the plate 20, thecylinder 18, and to themember 11. The end plate 20 has formed integralwith it a central hollow boss 21 in which the associated extreme end ofshaft 12 is journaled,

The cylinder 18 has a central or concentric opening 22 which defines thepump chamber. Disposed within this opening 22 is what 1 term a ringmember 23 which has a diameter slightly less than the diameter of theopening 22. Rotatably fitted in the ring member 23v eter that it isadapted to fill up substantially the entire groove 26, but yet at thesame time permit of a pivotal movement of the ring member 23. One end ofthis pin 28, as best shown in Figure 1, is tightly fitted in an 29 inend member openin 11 of the pump block 10. The other end of the pin 28is tightly fitted in an opening 30 formed in end plate 20. This pin 28is tightly held in these two openings 29 and 30, against movement.Moreover, it will be noted. that the end plate is properly aligned withend member 11 through the means of dowel pins 30.

The ring member 23 also has formed in it a pair of oil openings 31 and32, one being disposed on each side of groove 26. These oil openingspermit of some of the oil being pumped reaching the eccentric 24;,whereby the pump is self-lubricating. Of course, it is to be understoodthat my novel pump may be used to pump other fluids besides oil withoutdeviating from the features of my invention. Obviously if it is used topump another fluid, the openings 31 and 32 should be omitted. The pumpblock 10 has formed integral with it a pair of lateral extensions 33 and3a,

in each of which is a threaded opening 3536.

The opening 35 comprises the inlet of the pump, and the opening 36comprises the outlet of the pump. shown) may be threaded into theseopenings 35 and 36. The inlet 35 is disposed in communication with apassageway 37 (Figure 2) formed in the block 10. This passageway isclosed off at its lower end by a plug 38 threaded therein. The upper endof the passageway 37 intersects an opening 40 which extends clearthrough the plate 1].. It will, of course,

7 be understood that when the ring 23 is in either the position shown inFigures 3 or 5, the opening 40 will be disconnected from the pumpchamber or opening 22.

The opening 36 is disposed in communication with a passageway 4-2 whichhas a closure plug 43 threaded into its lower end. The upper endof thepassageway 42 communicates with an opening a3 which also eXtends clearthrough the member 11 and has its outer end in register with the pumpchamber or opening 22. The opening 43 has anenlarged portion-41 (Figure3) which communicates with the annularopening 22 in the cylinder 18; Ofcourse it must be noted that when the ring Suitable pipelines (notsubstantially flush with the outer surface of member or plate 11. Thisbox is held against rotation by means of a setscrew t5 threaded into theblock 10, as shown in Figure 1.

The oieration of m novel rotar Quinn will now be briefly discussed inCOllIlGQLlOIl with Figures 3, 4 and 5, which illustrate the variousphases of the operation of the pump. When the eccentric 24 is in theposition shown in Figure 3, it causes the ring member l 23 to assume aposition whereinthe pin 28 is disposed entirely within the groove orslot 26. thus result 'ng in both of the openings {L0 and 43 being csconnected from the chamber or opening 22. The rotation of the shaft 12in 7 a clockwise direction will result in the eccentrie 24- travelingfrom the position shown in O L l gure o to the position shown in h igure5. lVhen the ring member 22 is in this position, it will have beenmovedout of register with opening 40, whereby this opening is disposedin communication witl the pump chamber 22.

'Obviously this movement of the eccentric 24 will result in fluid beingdrawn into the pump through the opening 40 from the inlet 35.

Continued rotation of the eccentric 2 L will cause it to assume theposition shown in Figure 4, wherein the chamber 22 is connected throughthe opening 43 with the outlet 36, thus allowing the fluid to be forcedfrom the pump chamber. Thereafter the eccentric 24. travels through thetwo positions shown and described in connection with Figures 3 and 4,thus resulting in the entry of a fresh batch of liquid into the pump.

The ring-like member 23 is prevented from rotating with the eccentric24: due to the fixed pin 28 extending into the slot 26. This arrangementis such that it permits of the ringlike member 23 having the oscillatorymove-' ment previously described in connection with Figures 3, 4 and 5.Also it will be noted that the pin 28 (Figure is disposed between theopenings 43 and 40 and has its periphery 111 contact with the wall ofring member 23 de-' fining the chamber Therefore, it necessarily followsthat this pm ll will serve as a seal to prevent the l quid entering thepump from opening 40 from'lealring into opening 43. That is to say, thepin 28 serves as a par tition or barrier between the two openings 40 and4-3. This means that the liquid entering the chamber from the inlet 35must travel around with the ring 23 before it can be discharged into theopening 48 disposed in communication with the outlet 36.

Now, of course, it is to be understood that although I have illustratedand described in detail the preferred form of my invention, theinvention is not to be thus limited, but only in so far as defined bythe scope and spirit of the appended claims.

I claim as my invention:

1. In combination, in a rotary pump, a pump body including a cylinderhaving an annular opening comprising a pump chamber formed therein, anannular ring disposed in said chamber, an eccentric rotatable in saidring and adapted to impart an oscillatory motion to said ring, said ringhaving a slot formed in its periphery, and a pin fitted in said slot andrigidly connected to said cylinder, said ring being adapted to pivot onsaid pin during its movement by said eccentric.

2. In combination, in a rotary pump, a pump body including a cylinderhaving an annular opening comprising a pump chamber formed therein, anannular ring disposed in said chamber, an eccentric rotatable in saidring and adapted to impart an oscillatory motion to said ring, said ringhaving'a slot formed in its periphery, a pin fitted in said slot andrigidly connected to said cylinder, said ring being adapted to pivot onsaid pin during its movement by said eccentric, an inlet connected tosaid chamber on one side of said pin, and an outlet connected to saidchamber on the other side of said pin, said pin serving as a sealingbarrier between said lnlet'and outlet to prevent leakage of fluid fromthe inlet to the outlet.

3. In combination, in a rotary pump, a pump body including a cylinderhaving an annular opening comprising a pump chamber formed therein, anannular ring disposed in said chamber, an eccentric rotatable in saidring and adapted to impart an oscillatory motion to said ring, said ringhaving a slot formed in its periphery, and a cylindrical pin fitted insaid slot and connected to said cylinder, said ring being adapted topivot on said pin during its movement by said eccentric, said slotbeingslightly larger in width than the diameter of said pin, whereby saidring can move to and from said pin.

4:. In combination in a rotary pump, a pump body including a cylinderhaving an annular opening comprising a pump chamber formed therein, anannular ring dlsposed in said chamber, an eccentric rotatable in saidring and adapted to impart an oscillatory motion to said ring, said ringhaving a slot iormed in its periphery, and circular means fitted in saidslot and connected to saidcylinder about which said ring is arranged topivot during the movement of the ring by said eccentric without movingsaid means relative to said cylinder.

In testimony whereof I have hereunto subscribed my' name at Chicago,Cook County, Illinois.

oHiinLns L. RAYFIELD.

